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Thread: P0440...

  1. #1

    Default P0440...

    Well, got my first 'check engine' light with my 2002 'burban LT 4WD. P0440, 'evaporative emissions control system malfunction'. Anyone have any experience with this code on similar trucks?
    '02 'Burban LT 4wd w/2013 Z71 18" wheels

    Lightly Modded '99 Regal GS

  2. #2


    SO... I did a search after posting... Found these possible causes:

    1) Defective fuel cap
    2) EVAP canister or host cracked
    3) Purge of vent solenoid defective
    4) Vacuum leak at engine.

    Any one have anything to add?

  3. #3


    I had this in my 2002 silverado, on top of your gas tank there is a black valve, it is plugged full of dust(in my case) all you need to do is if it's mildly clogged, is take your air compressor and blow out the valve(first take it off and disconnect the line to your charcoal box, make sure they're both disconnected and blow out the line, both ways, to get all the dust out of the line.

    Here's a little diagram.
    2002 Chevrolet Silverado 1500 z71 1985 Chevrolet Silverado k10 2006 Chevrolet Silverado 2500hd 6.6l LLY Duramax
    6.5" BDS Suspension Lift Edelbrock Carb & Polished Intake Manifold & Valve Covers NAPC Race Transmission & NAPC Built Transfer Case
    EFI Live Comp Cam and Valvetrain Snow Performance Methanol Injection
    35" Toyo Open Country Mud Terrain on 18" Ion Alloy 179's Headman Long Tube Headers and True Dual Exhaust FASS 150gph Titanium Series Pump
    AirAid Cold Air Intake with K&N Dry Filter & AirAid PowerAid Throttle Body Spacer 2" Suspension Lift 33x12.50r15 Tires EFI Live & AFE Stage 2 Intake
    Pacesetter Long Tube Headers with Cats Gone True Dual Exhaust FlowPro 3.73 Gears Yukon Grizzly Locker with Mag-Hytec Cover & Traction Bars
    NGK Iridium Tips & MSD Ignition Plug Wires Baja Spare Tire Holder 33x13.5 Hankook rt03 18" XD Rims
    Innovate LC-1 Wideband o2 Sensor x2 HID's all around LED taillights and 3rd brake light
    BDS Dual Steering Stabilizers Pioneer Double-DIN Touchscreen Navigation with Two 10" Subs under rear seat
    Electric Fan Autometer Pressure, Boost, and Pyro Gauges
    4.56 Gears Airlift Air Bag Suspension

  4. #4


    Charcoal box #4? Valve #2?

  5. #5


    Stunned and amazed... a new gas cap fixed it.

  6. #6


    Ok... New gas cap didn't fix it for long. Suppose I'll check out that valve and hose. I suppose the hose is a dealer only part, what about the valve?

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